436 EXPERIMENT STATION RECORD. 



as from the application of the solid manure alone, though the same iiiiionnt of nitro- 

 gen was applied in each case. 



"The nitrogen in the leached solid manure was on the whole more effective than 

 in the fresh, while in the leached solid and liquid combined, it was much less effect- 

 ive than in the fresh. The loss of the liquid portion very materially reduced the 

 effectiveness of the manure. 



"The residual effect of the nitrogen in yard manure was very considerable, and 

 was greatest in the solid, fresh. 



"Nitrogen in the commercial products, nitrate of soda, sulphate of ammonia, and 

 dried blood, was more effective than in the natural manure i)roducts. Of these 3 

 forms, the nitrate was the most effective. 



"In these experiments for every 100 of gain derived from nitrate of soda, there 

 was a gain of 73.3 for sulphate of ammonia, and 65.3 for dried l)lood. 



"There was no increase in crops obtained from the residues of the nitrate, the 

 ammonia, and the dried blood, though in the case of the ammonia and blood a very 

 consiileral)le portion of the amount applied was not recovered in the first crop. 



"The percentage increased yields obtained in the crop innnediately following the 

 application of the different products showed that if nitrogen in the form oi nitrate, 

 which was used as the standard, cost 15 cts. per pound, the nitrogen in the manures 

 would be worth relative to it, as follows: Nitrogen in solid manure, fresh, 2.07 cts. 

 per j>ound; nitrogen in solid and liquid manure, fresh, 6.90 cts. .per pound; nitrogen 

 in solid manure, leached, 2.41 cts. per pound; and nitrogen in solid and liquid manure, 

 leached, 4.54 cts. per jMjund. 



" When the residual effect of nitrogen of the manures is taken into account and no 

 further api)lications of nitrate are made, the values of the nitrogen in the manures 

 relative to the nitrate are: In solid manure, fresh, 6.22 cts. per pound; in solid and 

 liquid manure, fresh, 11.69 cts. per pound; in solid manure, leached, 7.04 cts. per 

 pound; and in solid and licjuid manure, leached, 6.73 cts. per pound." 



Experiments on the application of manure, L. M.\lpe.\itx and E. Dokez {Ann. 

 Agron., 21 {1901), Nu. S, jrp. 353-356). — This is an account of experiments with fod- 

 der l)eets followed by wheat grown on plats on which manure was (1) plowed under 

 as soon as applied, and (2) spread and allowed to lie on the surface about 2 months 

 during winter l)efore being i)lowed under. The results were decidedly in favor of 

 plowing in immediately after application. 



Green manuring, A. L. Yakovlvev {Izr. Moscoir Sel.sk: Khoz. luM. \^Ann. Inst. 

 Agron. J/o.sroi'/], 6' ( 1900), pt. 4, ]>p. 503-5S3). — In order to compare the availability to 

 higher i)lants of the nitrogen of green manure with that < >f nitrate of soda, various kinds 

 of animal manures, and other nitrogenous fertilizers, the author raised crops of oats in 

 pots using as sources of nitrogen (1) nitrate of soda, (2) liquid manure, (3) fresh horse 

 feces, (4) fermented horse manure, (5) fresh cow manure (6) blood meal, and (7) 

 green manure. The experiments were made on sandy soil containing 0.076 per cent 

 of nitrogen. Each pot contaiued 6 kg. of soil. All the mineral nutrients were pres- 

 ent in quantities sufficient ior a maximum yield, while nitrogen was deficient. 

 Nitrate of soda was added in auiounts furnishing 0.5 gm. of nitrogen, while the other 

 fertilizers were used in quantities containing 1 gm. of nitrogen. The largest crop 

 was secured from the pot on which green manure was used. The order of effective- 

 ness of the other fertilizers was — nitrate of'soda, blood meal, and liquid manure. 

 The animal manure either did not increase the yield (as was the case with the fer- 

 mented horse manure) or diminished it (as was the case with the cow manure, and 

 especially with the fresh horse feces). 



Another series of experiments led the author to the conclusion that fresh green 

 manure and dry green manure are equally effective as nitrogen fertilizers. 



Other conclusions based partly ui)on a survey of the literature of the subject and 

 partly on the experiments of the author, are as follows: (1) When leguminous plants 



